🔥🧪 Combustion Test Failed – Internal Coolant Loss Detected | MX13 Engine 🧪🔥 This MX13 engine came in after the customer reported losing coolant with no visible external leaks. During inspection, our specialist tech performed a combustion gas test on the cooling system, and as shown in the test results, the fluid changed color — confirming combustion gases present in the coolant. 💡 What a failed combustion test means: A positive combustion test indicates that exhaust gases are entering the c